Pipe flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.
The socket welding flange is similar to a slip-on flange except it has a bore and a counterbore dimension.
The socket welding flange is similar to a slip-on flange except it has a bore and a counterbore dimension.
| Nominal Pipe Size | Outside Diameter of Flange | Diameter of Raised Face | Thickness of Flanges Min. | Diameter of Hub | Length Through Hub | Bore | Depth of Socket | Diameter of Bolt Circle | Diameter of Bolt Holes | Number of Bolts | Approxi-mate Weight kgs | |
| NPS | O | R | tf | X | Y | B1 | B2 | D | W | I | n | |
| 1/2 | 95 | 34.9 | 12.7 | 38 | 21 | 22.2 | 15.8 | 10 | 66.7 | 15.9 | 4 | 0.67 |
| 3/4 | 115 | 42.9 | 14.3 | 48 | 24 | 27.7 | 20.9 | 11 | 82.6 | 19.1 | 4 | 1.11 |
| 1 | 125 | 50.8 | 15.9 | 54 | 25 | 34.5 | 26.6 | 13 | 88.9 | 19.1 | 4 | 1.43 |
| 1 1/4 | 135 | 63.5 | 17.5 | 64 | 25 | 43.2 | 35.1 | 14 | 98.4 | 19.1 | 4 | 1.79 |
| 1 1/2 | 155 | 73.0 | 19.1 | 70 | 29 | 49.5 | 40.9 | 16 | 114.3 | 22.2 | 4 | 2.57 |
| 2 | 165 | 92.1 | 20.7 | 84 | 32 | 61.9 | 52.5 | 17 | 127.0 | 19.1 | 8 | 3.01 |
| 2 1/2 | 190 | 104.8 | 23.9 | 100 | 37 | 74.6 | 62.7 | 19 | 149.2 | 22.2 | 8 | 4.55 |
| 3 | 210 | 127.0 | 27.0 | 117 | 41 | 90.7 | 77.9 | 21 | 168.3 | 22.2 | 8 | 6.18 |